package cn.tedu.spring.bean;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;

/**
 * Controller:控制器层，接受请求返回响应
 * Service：业务层，处理业务逻辑
 * Repository：数据访问层，负责和数据库交互
 * Component：不分层，标识为普通的spring组件
 *
 *
 */
@Repository
//@Service
//@Controller
//@Component
public class UserDao {
    /**
     *  Value注解：属性值注入
     *    1.加载属性上;
     *    2.加载set方法上;
     *
     *  基本数据类型使用包装类更好一些，不包装也行
     *
     */
    @Value("jdbc:mysql://localhost:3306/tedu")
    private String dbUrl;
    @Value("root")
    private String username;
//    @Value("root")
    private String password;
    @Value("qwertiop")
    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "UserDao{" +
                "dbUrl='" + dbUrl + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}
